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Copy pathcipher
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cipher
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <conio.h>
void railFence (char *str, char *output, int length, int A);
void railFence2 (char *str, char *output, int length, int A, int B);
void railFence2dec (char *str, char *output, int length, int A, int B,int dir);
int main()
{
FILE *fr;
FILE *fw1, *fw2, *fw3;
char ch;
do{
int D;
printf("==========================================\n");
printf(" Menu\n");
printf("==========================================\n");
printf("1.Do you wish to input manually?\n");
printf("2.Do you wish to take input from file?\n");
scanf("%d", &D);
system("cls");
if ( D == 1) {
int N;
printf("==========================================\n");
printf(" Menu\n");
printf("==========================================\n");
printf("1.Classical Rail-fence encryption\n", N);
printf("2.Level 2 Rail-fence encryption\n", N);
printf("3.Level 2 Rail-fence decryption\n", N);
printf("4.Exit\n", N);
scanf("%d",&N);
system("cls");
if ( N == 1 )
{
fw1 = fopen("classical rail fence.txt", "w");
char *output[1024];
char *str[1000];
int i = 0, A, length;
printf ("Enter a Secret Message\n");
scanf (" %[^\n]%*c", str);
length = strlen (str);
printf ("Enter number of rails\n");
scanf ("%d", &A);
railFence (&str, &output, length, A);
printf ("%s\n", output);
fprintf(fw1, "Secret Message = %s\n", str);
fprintf(fw1, "Number of rails = %d\n", A);
fprintf(fw1, "Encrypted Message = %s", output);
fclose(fw1);
}
if ( N == 2)
{
int i = 0, A, B, length;
fw2 = fopen("level 2 encryption.txt", "w");
char output[1024];
char str[1000];
printf ("Enter a Secret Message\n");
scanf (" %[^\n]%*c", str);
printf ("Enter larger number of rails\n");
scanf ("%d", &A);
printf ("Enter number of rails 2\n");
scanf ("%d", &B);
length = strlen (str);
railFence2 (&str, &output, length, A, B);
printf ("%s\n", output);
fprintf(fw2, "Secret Message = %s\n", str);
fprintf(fw2, "Number of larger rails = %d\n", A);
fprintf(fw2, "Number of smaller rails = %d\n", B);
fprintf(fw2, "Encrypted Message = %s", output);
fclose(fw2);
}
if ( N == 3) {
int i = 0, A, B, length;
fw3 = fopen("level 2 decryption.txt", "w");
char output[1024];
char str[1000];
printf ("Enter a Encrypted Message\n");
scanf (" %[^\n]%*c", str);
printf ("Enter larger number of rails\n");
scanf ("%d", &A);
printf ("Enter number of rails 2\n");
scanf ("%d", &B);
length = strlen (str);
railFence2dec (&str, &output, length, A, B, 0);
printf ("%s", output);
fprintf(fw3, "Encrypted Message = %s\n", str);
fprintf(fw3, "Number of larger rails = %d\n", A);
fprintf(fw3, "Number of smaller rails = %d\n", B);
fprintf(fw3, "Decrypted Message = %s", output);
fclose(fw3);
}
if ( N == 4) {
exit(1);
}
}
if ( D == 2 ) {
int n;
fr = fopen("input in this.txt", "r");
fscanf(fr, "%d", &n);
if ( n == 1){
fw1 = fopen("classical rail fence.txt", "w");
char *output[1024];
char *str[1000];
int i = 0, A, length;
if( fgets (str, 60, fr)!=NULL )
{
puts(str);
}
length = strlen (str);
fscanf (fr,"%d", &A);
railFence (&str, &output, length, A);
printf ("%s\n", output);
fprintf(fw1, "Secret Message = %s\n", str);
fprintf(fw1, "Number of rails = %d\n", A);
fprintf(fw1, "Encrypted Message = %s", output);
fclose(fw1);
}
if ( n == 2){
}
if ( n == 3){
}
}
printf ("\n\n\n\Do you want to repeat the operation Y/N: \n");
scanf (" %c", &ch);
system("cls");
}
while (ch == 'y' || ch == 'Y');
}
void railFence (char *str, char *output, int length, int A)
{
int i, j, q, count;
char code[A][length];
for (i = 0; i < A; i++)
{
for (j = 0; j < length; j++)
{
code[i][j] = 0;
}
}
count = 0;
j = 0;
while (j < length)
{
if (count % 2 == 0)
{
for (i = 0; i < A; i++)
{
code[i][j] = (int) str[j];
j++;
}
}
else
{
for (i = A - 2; i > 0; i--)
{
code[i][j] = (int) str[j];
j++;
}
}
count++;
}
q = 0;
for (i = 0; i < A; i++)
{
for (j = 0; j < length; j++)
{
if (code[i][j] != 0)
{
output[q] = code[i][j];
q++;
}
}
}
output[q] = '\0';
}
void railFence2 (char *str, char *output, int length, int A, int B)
{
int i, j, c, p, q, y, count;
char code[A][length];
for (i = 0; i < A; i++)
{
for (j = 0; j < length; j++)
{
code[i][j] = 0;
}
}
p = 0;
q = 0;
j = 0;
count = 1;
for (i = 0; i < A; i++)
{
code[i][j] = (int) str[j];
j++;
}
y = B;
while (j < length)
{
if (q == 0)
{
i = i - 2;
for (int x = 1; x < y; x++)
{
code[i][j] = (int) str[j];
i--;
j++;
}
q = 1;
}
else
{
i = i + 2;
for (int x = 1; x < y; x++)
{
code[i][j] = (int) str[j];
i++;
j++;
}
q = 0;
}
if (count % 2 == 0)
{
if (y == B)
y = A;
else
y = B;
}
count++;
}
q = 0;
for (i = 0; i < A; i++)
{
for (j = 0; j < length; j++)
{
if (code[i][j] != 0)
{
output[q] = code[i][j];
q++;
}
}
}
output[q] = '\0';
}
void railFence2dec (char *str, char *output, int length, int A, int B,int dir)
{
int i, j, c, p, q, y, k, m=0, count;
char code[100][1000];
for(i=0;i<A;i++)
{
for(j=0;j<length;j++)
{
code[i][j]= 0;
}
}
p = 0;
q = 0;
j = 0;
count = 1;
for(i=0;i<A;i++)
{
code[i][j]= -1;
j++;
}
y=B;
while(j<length) {
if(q==0) {
i=i-2;
for(int x=1 ; x<y ; x++)
{
code[i][j]= -1;
i--;
j++;
}
q=1;}
else{
i=i+2;
for(int x=1 ; x<y ; x++)
{
code[i][j]= -1;
i++;
j++;
}
q=0;}
if(count%2==0)
{
if(y==B)
y=A;
else
y=B;
}
count++;
}
k = 0;
for(i=0;i<A;i++)
{
for(j=0;j<length;j++)
{
if (code[i][j] != 0)
{
code[i][j]=(int)str[k];
k++;
}
}
}
p = 0;
q = 0;
j = 0;
count = 1;
for(i=0;i<A;i++)
{
output[m] = code[i][j];
m++;
j++;
}
y=B;
while(j<length) {
if(q==0) {
i=i-2;
for(int x=1 ; x<y ; x++)
{
output[m] = code[i][j];
m++;
i--;
j++;
}
q=1;}
else{
i=i+2;
for(int x=1 ; x<y ; x++)
{
output[m] = code[i][j];
m++;
i++;
j++;
}
q=0;}
if(count%2==0)
{
if(y==B)
y=A;
else
y=B;
}
count++;
}
output[m] = '\0';
output[m] = '\0';
output[m] = '\0';
}